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/* $OpenBSD: siphash.h,v 1.6 2024/09/04 07:54:52 mglocker Exp $ */
/*-
* Copyright (c) 2013 Andre Oppermann <andre@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* SipHash is a family of pseudorandom functions (a.k.a. keyed hash functions)
* optimized for speed on short messages returning a 64bit hash/digest value.
*
* The number of rounds is defined during the initialization:
* SipHash24_Init() for the fast and reasonably strong version
* SipHash48_Init() for the strong version (half as fast)
*
* struct SIPHASH_CTX ctx;
* SipHash24_Init(&ctx);
* SipHash_SetKey(&ctx, "16bytes long key");
* SipHash_Update(&ctx, pointer_to_string, length_of_string);
* SipHash_Final(output, &ctx);
*/
#ifndef _SIPHASH_H_
#define _SIPHASH_H_
#define SIPHASH_BLOCK_LENGTH 8
#define SIPHASH_KEY_LENGTH 16
#define SIPHASH_DIGEST_LENGTH 8
typedef struct _SIPHASH_CTX {
uint64_t v[4];
uint8_t buf[SIPHASH_BLOCK_LENGTH];
uint32_t bytes;
} SIPHASH_CTX;
typedef struct {
uint64_t k0;
uint64_t k1;
} SIPHASH_KEY;
void SipHash_Init(SIPHASH_CTX *, const SIPHASH_KEY *);
void SipHash_Update(SIPHASH_CTX *, int, int, const void *, size_t)
__bounded((__buffer__, 4, 5));
uint64_t SipHash_End(SIPHASH_CTX *, int, int);
void SipHash_Final(void *, SIPHASH_CTX *, int, int)
__bounded((__minbytes__, 1, SIPHASH_DIGEST_LENGTH));
uint64_t SipHash(const SIPHASH_KEY *, int, int, const void *, size_t)
__bounded((__buffer__, 4, 5));
#define SipHash24_Init(_c, _k) SipHash_Init((_c), (_k))
#define SipHash24_Update(_c, _p, _l) SipHash_Update((_c), 2, 4, (_p), (_l))
#define SipHash24_End(_d) SipHash_End((_d), 2, 4)
#define SipHash24_Final(_d, _c) SipHash_Final((_d), (_c), 2, 4)
#define SipHash24(_k, _p, _l) SipHash((_k), 2, 4, (_p), (_l))
#define SipHash48_Init(_c, _k) SipHash_Init((_c), (_k))
#define SipHash48_Update(_c, _p, _l) SipHash_Update((_c), 4, 8, (_p), (_l))
#define SipHash48_End(_d) SipHash_End((_d), 4, 8)
#define SipHash48_Final(_d, _c) SipHash_Final((_d), (_c), 4, 8)
#define SipHash48(_k, _p, _l) SipHash((_k), 4, 8, (_p), (_l))
#endif /* _SIPHASH_H_ */
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